IBC 12-1
1203.4.2 Exceptions. The following are exceptions to Sections 1203.4 and 1203.4.1:
1. (No change)
2. (No change)
3. (No change)
4. Ventilation openings are not required where the ground surface is covered with a Class I vapor retarder, the perimeter walls are insulated and the space is conditioned in accordance with the as required by the International Energy Code for conditioned spaces and the space is conditioned in accordance with the International Mechanical
Code.
Reason:
10/23 notes: Revisions based on the fact that the IECC does not contain provisions for conditioned spaces rather the insulation required for the spaces. Another option would be to delete exception 4. The reorganization of 1203.4 could also be considered. Bowman to reorganize the section as one change, then exception 4 revisions as a separate change for discussion at our next meeting.

IBC 6-1
602.2 Types I and II. Types I and II construction are those types of construction in which the building elements listed in Table 601 are of noncombustible materials, except as permitted in Section 602.2.1 and elsewhere in this code.
602.2.1 Combustible materials used to construct building elements of Type I and II
Construction. Combustible materials shall be permitted to be used to construct building elements listed in Table 601 for Type I and II Construction for the following applications:
1. Fire-retardant-treated wood shall be permitted in:
1.1. Nonbearing partitions where the required fire-resistance rating is 2 hours or less.
1.2. Nonbearing exterior walls where fire-resistance rated construction is not required.
1.3. Roof construction, including girders, trusses, framing and decking.
Exception: In buildings of Type IA construction exceeding two stories above grade plane , fire-retardant- treated wood is not permitted in roof construction where the vertical distance from the upper floor to the roof is less than 20 feet (6096 mm).
2.
Millwork such as doors, door frames, window sashes and frames.
3. Where not installed greater than 15 feet (4572 mm) above grade, show windows, nailing or furring strips and wooden bulkheads below show windows, including their frames, aprons and show cases.
4. Partitions dividing portions of stores, offices or similar places occupied by one tenant only and that do not establish a corridor serving an occupant load of 30 or more shall be permitted to be constructed of fire-retardant-treated wood , 1-hour fire-resistance-rated construction or of wood panels or similar light construction up to 6 feet (1829 mm) in height.
5.
Stages and platforms constructed in accordance with Sections 410.3 and 410.4, respectively.
6. Blocking such as for handrails, millwork, cabinets and window and door frames.
7. Mastics and caulking materials applied to provide flexible seals between components of exterior wall construction.
8. Heavy timber as permitted by Note c to Table 601 and Sections 602.4.7 and 1406.3.
9.. Aggregates, component materials and admixtures as permitted by Section 703.2.2.
10. Sprayed fire-resistant materials and intumescent and mastic fire-resistant coatings, determined on the basis of fire-resistance tests in accordance with Section 703.2 and installed in accordance with Sections 1705.13 and 1705.14, respectively.
11. Materials used to protect penetrations in fire-resistance-rated assemblies in accordance with
Section 714.
12. Wall construction of freezers and coolers of less than 1000 square feet (92.9 m
2
), in size, lined on both sides with noncombustible materials and the building is protected throughout with an automatic sprinkler system in accordance with Section 903.3.1.1.

602.2.2 Combustible materials used within or on building elements of Type I and II Construction.
Combustible materials attached to the building element or installed within a building element shall be as permitted elsewhere in the code.
Delete Section 603:
SECTION 603
COMBUSTIBLE MATERIAL IN TYPE I AND II CONSTRUCTION
603.1 Allowable materials. Combustible materials shall be permitted in buildings of Type I or II construction in the following applications and in accordance with Sections 603.1.1 through 603.1.3:
1. Fire-retardant-treated wood shall be permitted in:
1.1. Nonbearing partitions where the required fire-resistance rating is 2 hours or less.
1.2. Nonbearing exterior walls where fire-resistance rated construction is not required.
1.3. Roof construction, including girders, trusses, framing and decking.
Exception: In buildings of Type IA construction exceeding two stories above grade plane , fireretardant- treated wood is not permitted in roof construction where the vertical distance from the upper floor to the roof is less than 20 feet (6096 mm).
2. Thermal and acoustical insulation, other than foam plastics, having a flame spread index of not more than
25.
Exceptions:
1. Insulation placed between two layers of noncombustible materials without an intervening airspace shall be allowed to have a flame spread index of not more than 100.
2. Insulation installed between a finished floor and solid decking without intervening airspace shall be allowed to have a flame spread index of not more than 200.
3. Foam plastics in accordance with Chapter 26.
4. Roof coverings that have an A, B or C classification.
5. Interior floor finish and floor covering materials installed in accordance with Section 804.
6. Millwork such as doors, door frames, window sashes and frames.
7. Interior wall and ceiling finishes installed in accordance with Sections 801 and 803.
8. Trim installed in accordance with Section 806.
9. Where not installed greater than 15 feet (4572 mm) above grade, show windows, nailing or furring strips and wooden bulkheads below show windows, including their frames, aprons and show cases.
10. Finish flooring installed in accordance with Section 805.
11. Partitions dividing portions of stores, offices or similar places occupied by one tenant only and that do not establish a corridor serving an occupant load of 30 or more shall be permitted to be constructed of

fire-retardant-treated wood , 1-hour fire-resistance-rated construction or of wood panels or similar light construction up to 6 feet (1829 mm) in height.
12. Stages and platforms constructed in accordance with Sections 410.3 and 410.4, respectively.
13. Combustible exterior wall coverings , balconies and similar projections and bay or oriel windows in accordance with Chapter 14.
14. Blocking such as for handrails, millwork, cabinets and window and door frames.
15. Light-transmitting plastics as permitted by Chapter 26.
16. Mastics and caulking materials applied to provide flexible seals between components of exterior wall construction.
17. Exterior plastic veneer installed in accordance with Section 2605.2.
18. Nailing or furring strips as permitted by Section 803.11.
19. Heavy timber as permitted by Note c to Table 601 and Sections 602.4.7 and 1406.3.
20. Aggregates, component materials and admixtures as permitted by Section 703.2.2.
21. Sprayed fire-resistant materials and intumescent and mastic fire-resistant coatings, determined on the basis of fire-resistance tests in accordance with Section 703.2 and installed in accordance with Sections
1705.13 and 1705.14, respectively.
22. Materials used to protect penetrations in fire-resistance-rated assemblies in accordance with Section
714.
23. Materials used to protect joints in fire-resistance-rated assemblies in accordance with Section 715.
24. Materials allowed in the concealed spaces of buildings of Types I and II construction in accordance with Section 718.5.
25. Materials exposed within plenums complying with Section 602 of the International Mechanical Code .
26. Wall construction of freezers and coolers of less than 1000 square feet (92.9 m
2
), in size, lined on both sides with noncombustible materials and the building is protected throughout with an automatic sprinkler system in accordance with Section 903.3.1.1.
603.1.1 Ducts. The use of nonmetallic ducts shall be permitted where installed in accordance with the limitations of the International Mechanical Code .
603.1.2 Piping. The use of combustible piping materials shall be permitted where installed in accordance with the limitations of the International Mechanical Code and the International Plumbing Code .
603.1.3 Electrical. The use of electrical wiring methods with combustible insulation, tubing, raceways and related components shall be permitted where installed in accordance with the limitations of this code.
10/23 notes: Revise as shown. Reason statement to include a table that shows where all items went from the original 603. Consider adding language to 602.3 and 602.4 for allowable combustible materials in noncombustible exterior walls.